Effect of 4,5',8-trimethylpsoralen interstrand cross-links present in recipient Bacillus subtilis on the integration of transforming DNA.
AUTOR(ES)
Mooibroek, H
RESUMO
When recipient Bacillus subtilis carrying chromosomal trimethylpsoralen cross-links were transformed, the donor marker activity decreased with the extent of cross-linking. Additional donor marker activity was lost upon incubation of the reextracted DNA with nuclease S1, particularly at higher levels of cross-linking. Physical analysis of the reextracted DNA showed that the donor DNA was progressively excluded from heteroduplex formation as the frequency of cross-links in the recipient DNA increased. In the donor-recipient complexes still being formed, increasing amounts of donor DNA became susceptible to nuclease S1 digestion under these conditions. These results suggest that resident interstrand cross-links interfere both with initiation of recombination and with the completion of heteroduplex formation.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=221514Documentos Relacionados
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